Two cars left the city for a suburb, 120 km away, at the same time. The speed of one of the cars was 20 km/hour greater than the speed of the other, and that is why it arrived at the suburb 1 hour before the other car. What is the speed of both cars.?
The time it took the faster car to reach the suburb is
The speed of the slower car is
The speed of the faster car is
Since the faster car travelled
Now multiply both sides by
Simplify, distribute, factor, disregard, etc. Essentially, solve.
We know that the speed of the slower car is